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CVE-2026-45783— libp2p: Unvalidated PUT_VALUE records allow unbounded disk exhaustion on DHT server nodes

Quick assessment

Affected
libp2p js-libp2p
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libp2p是libp2p开源的一个模块化点对点网络框架。 libp2p 16.2.6之前版本存在输入验证错误漏洞，该漏洞源于未经验证的远程对等节点可发送无限制的PUT_VALUE消息流，可能导致磁盘存储耗尽。

CVSS 7.5 · High EPSS 0.50% · P42

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
libp2p js-libp2p < 16.2.6 affected
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I. Basic Information for CVE-2026-45783

Vulnerability Information
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Vulnerability Title
libp2p: Unvalidated PUT_VALUE records allow unbounded disk exhaustion on DHT server nodes
Source: CVE Program / CVE List V5
Vulnerability Description
libp2p is a JavaScript Implementation of libp2p networking stack. Prior to version 16.2.6, an unauthenticated remote peer can exhaust the disk storage of any @libp2p/kad-dht node running in server mode by sending an unbounded stream of PUT_VALUE messages whose keys bypass all content validation. No credentials, no prior relationship, and no protocol deviation beyond a crafted key are required. The victim node's datastore fills until the host disk is exhausted, making the node unavailable. This issue has been patched in version 16.2.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
libp2p 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libp2p是libp2p开源的一个模块化点对点网络框架。 libp2p 16.2.6之前版本存在输入验证错误漏洞，该漏洞源于未经验证的远程对等节点可发送无限制的PUT_VALUE消息流，可能导致磁盘存储耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
libp2p js-libp2p < 16.2.6 -

II. Public POCs for CVE-2026-45783

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7171 chars
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III. Intelligence Information for CVE-2026-45783

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Vendor Advisories for CVE-2026-45783 (1)

IV. Related Vulnerabilities

Same product: js-libp2p
Same vendor: libp2p
Same weakness: CWE-20

V. Comments for CVE-2026-45783

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